ZVS-PWM flyback converter with a simple auxiliary circuit

Wang, C.-M.; Su, Ching-Hung; Yang, Cheng-Hsiung

doi:10.1049/ip-epa:20050123

Cited by 32 publications

(19 citation statements)

References 5 publications

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“…Comparative analysis is carried out with the proposed topology, and the topology without voltage doubler circuit is mentioned in [1]. The results obtained are presented in the Figs.…”

Section: Discussionmentioning

confidence: 99%

“…Figure 6 shows the efficiency curve for the proposed converter with an efficiency of 85 % at rated load for the power circuit alone. From this, it is deduced that the proposed converter efficiency is greater than the ZVS-PWM flyback converter topology [1] as shown in table 3. This is because of the output capacitor and rectifier diodes that is, the voltage doubler increases the power level of the converter and so the efficiency also increases.…”

Section: Hardware Implementationmentioning

confidence: 93%

“…The mode circuit diagrams are as shown in Fig. 2 and the theoretical waveforms are as shown in [1]. The equations governing the modes are tabled in the Appendix.…”

Section: Modes Of Operationmentioning

confidence: 99%

“…To achieve soft switching in the switches, the design of L r and C r are carried out with ZVS criteria as explained in [1] and the designed values are tabulated in Table 2. The transformer design is also carried out and the details are tabulated in Table 2 [2][3][4][5][6].…”

Section: Designmentioning

confidence: 99%

“…(ii) Resonant section-Auxiliary diodes D2, D4, the resonant inductors L r , the resonant capacitors C r , and auxiliary switch S a [1]. (iii) Voltage doubler-Resonant capacitor C d , and rectifier diodes D 11 , D 12 .…”

Section: Introductionmentioning

confidence: 99%

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High Efficiency Single Output ZVS–ZCS Voltage Doubled Flyback Converter

Deepa

Saju²,

Kumar

2014

J. Inst. Eng. India Ser. B

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A switch operating at high switching frequency increases the switching losses of the converter resulting in lesser efficiency. Hence this paper proposes a new topology which has resonant switches [zero voltage switching (ZVS)] in the primary circuit to eliminate the above said disadvantages, and voltage doubler zero current switching (ZCS) circuit in the secondary to double the output voltage, and hence the output power, power density and efficiency. The design aspects of the proposed topology for a single output of 5 V at 50 kHz, its simulation and hardware results are discussed in detail. The analysis of the results obtained from a 2.5 W converter reveals the superiority of the proposed converter.

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“…Comparative analysis is carried out with the proposed topology, and the topology without voltage doubler circuit is mentioned in [1]. The results obtained are presented in the Figs.…”

Section: Discussionmentioning

confidence: 99%

Section: Hardware Implementationmentioning

confidence: 93%

“…The mode circuit diagrams are as shown in Fig. 2 and the theoretical waveforms are as shown in [1]. The equations governing the modes are tabled in the Appendix.…”

Section: Modes Of Operationmentioning

confidence: 99%

Section: Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High Efficiency Single Output ZVS–ZCS Voltage Doubled Flyback Converter

Deepa

Saju²,

Kumar

2014

J. Inst. Eng. India Ser. B

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Two‐switch flyback PWM DC–DC converter in discontinuous‐conduction mode

Murthy-Bellur

Kazimierczuk

2011

Circuit Theory & Apps

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SUMMARYThe two-switch flyback DC-DC converter is an extended version of the conventional single-switch flyback converter. An additional switch and two clamping diodes serve as a simple, but an effective way to limit the switch overvoltages, which occur in the conventional single-switch flyback converter due to the ringing of the resonant circuit formed by the transformer leakage inductance and the transistor output capacitance. The clamping diodes in the two-switch flyback topology clamp the maximum voltage across each switch equal to the DC input voltage. This paper presents a detailed analysis and design procedure of the diode-clamped two-switch flyback converter operated in discontinuous-conduction mode (DCM). A comparison of power losses of the two-switch and the single-switch flyback converters is given. The two-switch flyback converter was bread-boarded to validate the theoretical analysis. Experimental results from a 20-V/30-W, 100-kHz laboratory prototype verified that the maximum switch voltage is limited to the DC input voltage.

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Two‐switch flyback PWM DC‐DC converter in continuous‐conduction mode

Murthy-Bellur

Kazimierczuk

2011

Circuit Theory & Apps

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SUMMARYThe two-switch flyback DC-DC converter is an extended version of the conventional single-switch flyback converter. An additional switch and two clamping diodes serve as a simple, but an effective way to limit the switch overvoltages, which occur in the conventional single-switch flyback converter due to the ringing of the resonant circuit formed by the transformer leakage inductance and the transistor output capacitance. The clamping diodes in the two-switch flyback topology clamp the maximum voltage across each switch equal to the DC input voltage. This paper presents a detailed steady-state analysis and design procedure of the diode-clamped two-switch flyback converter operated in continuous-conduction mode (CCM). The power loss in each component of the two-switch flyback converter is compared with those of the single-switch flyback converters with and without RCD clamp, and is presented in a tabular form. The two-switch flyback converter was bread-boarded to validate the theoretical analysis. Experimental results from a 10 V/30 W, 100 kHz laboratory prototype verified that the maximum switch voltage is limited to the DC input voltage.

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ZVS-PWM flyback converter with a simple auxiliary circuit

Cited by 32 publications

References 5 publications

High Efficiency Single Output ZVS–ZCS Voltage Doubled Flyback Converter

High Efficiency Single Output ZVS–ZCS Voltage Doubled Flyback Converter

Two‐switch flyback PWM DC–DC converter in discontinuous‐conduction mode

Two‐switch flyback PWM DC‐DC converter in continuous‐conduction mode

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